Designation:D4972−13StandardTestMethodforpHofSoils1ThisstandardisissuedunderthefixeddesignationD4972;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1ThistestmethodcoversthemeasurementofthepHofsoilsforusesotherthanforcorrosiontesting.Suchmeasure-mentsareusedintheagricultural,environmental,andnaturalresourcesfields.Thismeasurementdeterminesthedegreeofacidityoralkalinityinsoilmaterialssuspendedinwateranda0.01Mcalciumchloridesolution.Measurementsinbothliquidsarenecessarytofullydefinethesoil’spH.Thisvariableisusefulindeterminingthesolubilityofsoilmineralsandthemobilityofionsinthesoilandassessingtheviabilityofthesoil-plantenvironment.Amoredetaileddiscussionoftheusefulnessofthisparameterisnotwarrantedhere;however,itcanbefoundinmanydiscussionsofthesubject.AfewsuchdiscussionsaregivenasRefs(1-6)2attheendofthetext.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3AllmeasuredandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3C670PracticeforPreparingPrecisionandBiasStatementsforTestMethodsforConstructionMaterialsD653TerminologyRelatingtoSoil,Rock,andContainedFluidsD1193SpecificationforReagentWaterD3740PracticeforMinimumRequirementsforAgenciesEngagedinTestingand/orInspectionofSoilandRockasUsedinEngineeringDesignandConstructionD6026PracticeforUsingSignificantDigitsinGeotechnicalDataG51TestMethodforMeasuringpHofSoilforUseinCorrosionTesting3.Terminology3.1Definitions:3.1.1Forcom...
